| 摘要 |
<p>An apparatus, system, and method for punching holes at any location along the length of an elongate hollow body (14) comprising an expandable die (2) which is insertable into the elongate hollow body (14). The elongate hollow body (14) may have any shape and be of any length. In operation, the expandable die (2) cooperates with the punch or punches (18, 20) of an external, conventional punch press (4). The expandable die (2) self-aligns its die cavity or cavities (24, 26) with the punch or punches (18, 20) of the external punch press (4). The expandable die (2) can expand to support the elongate hollow body (14) during the punching operation to avoid denting or other damage to the elongate hollow body (14).</p> |
